Method and a system for position detection

A method for using a system including a plurality of first fields and a plurality of second fields fixed to a first device and presenting a first physical characteristic and a second physical characteristic, respectively, the first and second fields being arranged in an alternating manner. First and second sensors are fixed to the second device and arranged to move along the array of fields when the second device moves in relation to the first device. The method includes detecting, by the first sensor and during a movement of the second device in relation to the first device, a transition from the first to the second physical characteristic, or vice versa, simultaneously detecting, by the second sensor, the first or the second physical characteristic, and determining, based on the detected transition and physical characteristic, the direction of movement of the second device in relation to the first device.